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Investments in equity securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of investments in equity securities | Investments in equity securities are summarized as follows (in millions).
| Cost Basis |  |  | Net Unrealized Gains |  |  | Fair Value |
September 30, 2025 |  |  |  |  |  |  |  |
Banks, insurance and finance | $ | 14,966 |  |  | $ | 82,006 |  |  | $ | 96,972 |
Consumer products |  | 12,198 |  |  |  | 80,191 |  |  |  | 92,389 |
Commercial, industrial and other |  | 56,013 |  |  |  | 37,867 |  |  |  | 93,880 |
| $ | 83,177 |  |  | $ | 200,064 |  |  | $ | 283,241 |
December 31, 2024 |  |  |  |  |  |  |  |
Banks, insurance and finance | $ | 15,707 |  |  | $ | 75,936 |  |  | $ | 91,643 |
Consumer products |  | 12,658 |  |  |  | 92,091 |  |  |  | 104,749 |
Commercial, industrial and other |  | 47,141 |  |  |  | 28,055 |  |  |  | 75,196 |
| $ | 75,506 |  |  | $ | 196,082 |  |  | $ | 271,588 |

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